ISO 1068:1975

Name: ISO 1068:1975 — Plastics — Homopolymer and copolymer resins of vinyl chloride — Determination of compacted apparent bulk density
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Plastics — Homopolymer and copolymer resins of vinyl chloride — Determination of compacted apparent bulk density

Название (английский):

ISO 1068:1975

Plastics — Homopolymer and copolymer resins of vinyl chloride — Determination of compacted apparent bulk density

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 2
Дата публикации:: 1 июня 1975 г.
Издание:: ISO IS 1068 edition 1 version 1
ICS:: 83.080.20

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Описание (английский):

Specification of a method for the determination of the bulk density of PVC-polymers, densified by vibration under specified conditions. A weighed test portion is filled into a measuring cylinder and densified by means of a specified vibration apparatus. Calculation of the apparent bulk density from the weight and the measured volume after densification.

Abstract

Похожие стандарты

Другие стандарты ISO

Overview

ISO 1068:1975 - Plastics - Homopolymer and copolymer resins of vinyl chloride - Determination of compacted apparent bulk density - specifies a laboratory method to measure the compacted apparent bulk density of PVC resins. The procedure densifies a weighed sample by vibration under defined conditions and calculates the bulk density from the sample mass and the compacted volume (density = m / V). This standard is essential for quality control, material specification, and process optimisation where powder packing and flow behaviour of PVC powders matter.

Key topics and technical requirements

Scope: Applies to homopolymer and copolymer resins of vinyl chloride (PVC resins) and measures compacted (vibration-densified) apparent bulk density.

Sample and measurement:

Use a precision 250 ml graduated glass cylinder, graduated in 2 ml with at least 50 ml non‑graduated top; internal diameter ≈ 38 mm; mass ≈ 220 ± 40 g.
Weigh the empty cylinder and the cylinder with sample to 0.1 g accuracy. Typical test portion ≈ 100 g.
Read volumes to the nearest 1 ml.

Compaction apparatus and conditions:

Shaking machine: 100–250 falls per minute, fall height 3 ± 0.2 mm.
Cylinder holder mass: 450 ± 20 g.
Metallic piston: diameter slightly less than cylinder internal diameter for levelling without compaction.

Procedure:

Fill cylinder, place in shaker, perform 1 250 ± 50 cycles, level, read volume.
Repeat a further 1 250 ± 50 cycles and read again. If readings differ by ≤ 2 ml, take the lower volume; if > 2 ml, continue in 1 250‑cycle increments until two successive readings differ ≤ 2 ml.
Calculate compacted apparent bulk density as m (g) / V (ml); report in g/ml.

Instrumentation tolerances and repeatability are specified to ensure comparable results across labs.

Applications and users

Useful for PVC manufacturers, compounders and masterbatch producers for incoming material inspection, process control (feeding, dosing, blending), and packing/transport decisions.

Employed by quality control laboratories, independent testing labs, R&D teams and material procurement specialists to specify and compare powder handling properties.

Helps predict powder behavior in extrusion, molding feed systems and automated dosing equipment where packed bulk density affects throughput and formulation accuracy.

Related standards

ISO 1068:1975 references the non‑compacted apparent bulk density method in ISO/R 60 (Determination of apparent density of moulding material pourable from a specified funnel).

Users should consult other PVC test standards and local regulatory test methods for complementary physical and chemical characterisation.

ISO 1068:1975

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

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